公开(公告)号：EP2805857A4

公开(公告)日：2016-01-27

申请号：EP13738180

申请日：2013-01-18

申请人： HITACHI CONSTRUCTION MACHINERY

发明人： NAKAMURA YUTA ,  KODAKA KATSUAKI ,  KAYANE MASAHIRO

IPC分类号： B60T7/12 ,  B60T7/02 ,  B60T7/04 ,  B60T8/17 ,  B60T8/32 ,  B60T13/16 ,  B60T13/66 ,  B60T13/68 ,  E02F9/20 ,  E02F9/22 ,  F16D55/24 ,  G05G9/047

CPC分类号： B60T7/045 ,  B60T8/17 ,  B60T8/326 ,  B60T13/168 ,  B60T13/662 ,  B60T13/686 ,  E02F9/2012 ,  E02F9/2253 ,  E02F9/226 ,  E02F9/2292 ,  F16D55/24 ,  G05G9/047

公开(公告)号：EP2636910A4

公开(公告)日：2016-07-13

申请号：EP11837981

申请日：2011-10-31

申请人： HITACHI CONSTRUCTION MACHINERY

发明人： KODAKA KATSUAKI ,  NAKAMURA YUTA ,  KAYANE MASAHIRO ,  ICHIMURA KAZUHIRO

IPC分类号： F15B21/04 ,  B01D35/147 ,  E02F9/22 ,  F15B11/028

CPC分类号： E02F9/2217 ,  E02F9/225 ,  E02F9/226 ,  F15B21/041 ,  F15B2211/30505 ,  F15B2211/50518 ,  F15B2211/615 ,  F15B2211/625

摘要： [Problem] To permit guiding oil of a high pressure in an oil passage section, which communicates a valve device and a filter to each other, to a relief valve by a relatively inexpensive structure even when clogging occurs in a filter arranged in an oil passage communicating the valve device and the relief valve to each other. [Solution] A hydraulic pump (20) and a charge valve (25), to which pressure oil is fed from the hydraulic pump (20) via an oil passage (26), are arranged. Arranged in the charge valve (25) are a valve device, for example, an on/off valve (33) switchable according to pressure oil delivered from the hydraulic pump (20), a relief valve (34) specifying a maximum of switching pressure for the on/off valve (33), and a filter (36) arranged in an oil passage (35) communicating the on/off valve (33) and the relief valve (34) to each other. In the oil passage (35), a check valve (37) is arranged in parallel with the filter (36) such that a flow of pressure oil from a side of the on/off valve (33) toward a side of the relief valve (34) is allowed but a flow of pressure oil from the side of the relief valve (34) toward the side of the on/off valve (33) is prevented.

公开(公告)号：EP2700755A4

公开(公告)日：2015-04-22

申请号：EP12774784

申请日：2012-04-12

申请人： HITACHI CONSTRUCTION MACHINERY

发明人： KURIKUMA HAJIME ,  TAKISHITA TATSUO ,  NAKAMURA YUTA

IPC分类号： E02F9/20 ,  B60L7/14 ,  B60L11/18 ,  B60L15/20 ,  E02F3/32 ,  E02F9/22 ,  F15B11/00 ,  H02J7/14

CPC分类号： E02F9/2058 ,  B60L7/14 ,  B60L11/1803 ,  B60L15/2009 ,  B60L2200/40 ,  B60L2210/12 ,  B60L2240/421 ,  B60L2240/423 ,  E02F3/325 ,  E02F9/207 ,  E02F9/2075 ,  E02F9/2091 ,  E02F9/2217 ,  E02F9/2246 ,  E02F9/2282 ,  E02F9/2285 ,  H02J7/14 ,  Y02T10/642 ,  Y02T10/645 ,  Y02T10/70 ,  Y02T10/7005 ,  Y02T10/7233 ,  Y02T10/7275

公开(公告)号：EP3231968A4

公开(公告)日：2018-07-18

申请号：EP15867373

申请日：2015-10-29

申请人： HITACHI CONSTRUCTION MACHINERY TIERRA CO LTD

发明人： NAKAMURA YUTA ,  TAKISHITA TATSUO ,  YUNOUE MASAYUKI ,  NOMURA TAKUYA ,  SAKISAKA KEISUKE

IPC分类号： E05B49/00 ,  B60R25/24 ,  E02F3/32 ,  E02F9/00 ,  E02F9/20 ,  E02F9/24 ,  F02D29/04 ,  F02D29/06 ,  F02N11/08 ,  H04L9/32

CPC分类号： B60R25/24 ,  B60R2325/308 ,  E02F3/32 ,  E02F3/325 ,  E02F3/964 ,  E02F9/2062 ,  E02F9/24 ,  E02F9/265 ,  E05B49/00 ,  F02D29/04 ,  F02D29/06 ,  F02N11/08 ,  H04L9/32

摘要： A hydraulic excavator (1) includes a wireless authentication device (42) performing wireless authentication with a portable key device (41) and a vehicle body controller (39) allowing or prohibiting start of the engine (15) on the basis of authentication by the wireless authentication device (42) and an operation of a power switch (12). The wireless authentication device (42) transmits a request signal within an authenticable range and performs authentication when it receives an ID code for authentication replied from the portable key device (41) on the basis of the transmitted request signal. The vehicle body controller (39) allows start of the engine (15) by the power switch (12) when a gate lock lever (13) is switched to a lock position and the wireless authentication device (42) performs authentication by the portable key device (41).